Dale Parfitt wrote:

...
Hi John,
You might want to post in the boatanchors group or the shortwave group
also.
I well recall collecting "tubistors" at Dayton some years back for a friend
who wanted them for his S line. They were plug in replacements for the
tubes.

Dale W4OP



Your text brings the old nuvistors back to mind ... hot devices, for
their time. As I remember, whether correctly or not, they were offered
by the tube manufacturers in an attempt to compete with transistors--a
failed attempt ...

Regards,
JS